A finite-element method for calculating the illumination-dependence of absorption in three-dimensional nanostructures is presented based on the radio frequency module of the Comsol Multiphysics software package (Comsol AB). This method is capable of numerically determining the optical response and near-field distribution of subwavelength periodic structures as a function of illumination orienta...

The vanadium-titanium black ceramic (VTBC) coating on all-ceramic solar collectors has both high absorptance (0.94) and emissivity (90%). However, the thermal conductivity of is very low (1.256 W/mK). To improve heat collection efficiency VTBC collectors, this paper establishes a mathematical model based energy-conservation relationships under steady-state conditions creates corresponding compu...

new selective coating materials are developed and used in advanced solar collector and absorber designs with improved efficiency. cobalt and copper sulfides nanoparticles are high interest for absorbers of solar thermal collectors due to their optical properties and high absorptance in the solar wavelength range (> 96%). in the present work, cobalt and copper sulfides nanoparticles were synthes...

New selective coating materials are developed and used in advanced solar collector and absorber designs with improved efficiency. Cobalt and Copper sulfides nanoparticles are high interest for absorbers of solar thermal collectors due to their optical properties and high absorptance in the solar wavelength range (> 96%). In the present work, Cobalt and Copper sulfides nanoparticles were synthes...

A database for storing and searching spectral curves is presented. The database gives the user of a synthetic imaging system a means to select spectral reflectance, emittance, transmittance, and absorptance curves for use in the realistic image synthesis process. This provides an alternative to the usual RGB and HSV interfaces that are typically used for image color selection and specification....